No mobs spawning

[xemnes]

my monsters will not spawn in my world, i tried a few troubleshooting steps, disabled all plugins, checking to see if spawn-monsters=true, checked to see natural-monsters=Zombie,Spider,Creeper,Skeleton and also checked the spawn rate which is set to 2 which is default but i tried changing it to 100 like some guy said but still doesnt spawn any
i get alot of moved wrongly! 0entityCreeper errors in my console though just like to mention